CN2664650Y - A Negative Feedback Control Device for Motor Speed of a Massage Chair/Cushion - Google Patents

Abstract

The utility model belongs to the technical field of automatic control technique and specifically relates to a control device of massage armchair pad. It comprises the following components: the massage machine comprises a synchronous circuit, a massage force setting input part, a silicon controlled control angle adjusting part, a power part, a direct current motor and a massage executing mechanism, and in addition, a motor speed detecting circuit, a counting circuit, a comparison circuit and a digital PID are connected between the direct current motor and the massage force setting input part. Because the motor speed detection circuit, the counting circuit, the comparison circuit and the digital PID are arranged between the direct current motor and the massage force setting input part, the rotating speed of the direct current motor can be fed back to the comparison circuit by the motor speed detection circuit and the counting circuit and is compared with the numerical value input by the massage force setting input part, and the comparison circuit outputs a control signal which is sent to the silicon controlled rectifier control angle adjusting part by the digital PID to control the rotating speed of the direct current motor, thereby achieving the massage force which is satisfied by a user.

Description

A motor speed negative feedback control device for a massage chair/cushion

Technical field:

The utility model relates to the technical field of automatic control, in particular to a control device for a massage chair/cushion.

Background technique:

At present, with the acceleration of the pace of life, people not only hope to relax their tense nerves after intense work, but also hope that their bodies can relax as much as possible so that they can have more energy to meet the next round of work and stress. life challenges. Various massage chairs/pads appearing on the market are just in order to meet people's needs in this respect, as shown in accompanying drawing 1: existing massage chairs/pads, its internal control device mainly includes synchronous circuit, massage force giving Fixed part, SCR control angle adjustment part, power part, massage motor (DC motor) and massage actuator. When in use, input the setting value to the thyristor control angle adjustment part through the massage force given part, and the thyristor control angle adjustment unit outputs the control signal to the power part (silicon controlled rectifier), which drives the massage motor, and then The massage actuator is driven by the massage motor, so that the massage mechanism performs corresponding massage, kneading and beating actions on the user's body to relax the user's body. However, we can see from the accompanying drawing 1 that due to the open-loop control method adopted by the control device of this massage chair/cushion, there is no negative feedback part, and the control device cannot be adjusted accordingly according to the external load during use. The speed of the massage motor (DC motor), that is, the strength of the massage actuator. But we know: because the user's weight, fat and thin are different, for lighter people, the pressure on the massage machine is less, and the speed of the massage motor does not change much compared with that of no-load; Larger and stronger people put more pressure on the massage machine, that is to say, the load on the massage motor is larger, resulting in a significant decrease in the speed of the massage motor, which cannot reach the strength required by the user; When the mechanism massages different parts of the body, because the human body has a certain curve, the protruding part of the curve will generate relatively large pressure on the massage machine (such as when the massage actuator performs massage actions), and it is easy to cause the speed of the massage motor to drop significantly. In addition, even if the massage actuator is fixed on a certain part for massage (such as when the massage actuator performs a kneading action), due to the different body shapes of the users, some places may also cause the speed of the massage motor to drop due to the high pressure; finally, Some massage chairs that can realize various postures such as sitting and lying down also have the situation that the intensity adjustment of the massage machine cannot meet the user's massage requirements due to the large load.

Invention content:

The purpose of this utility model is to provide a negative feedback control device for motor speed of a massage chair/cushion that can solve the above-mentioned problems in view of the deficiencies of the prior art.

In order to achieve the above object, the utility model includes a synchronous circuit, a given massage force input part, a thyristor control angle adjustment part, a power part, a DC motor and a massage actuator, and is characterized in that: the DC motor and the massage force given The motor speed detection circuit, counting circuit, comparison circuit, and digital PID are also connected between the input parts. The speed of the DC motor is fed back to the comparison circuit by the motor speed detection circuit and the counting circuit to compare with the value input by the massage force given input part. The comparison result is sent to the thyristor control angle adjustment part through the digital PID from the output terminal of the comparison circuit to control the speed of the DC motor.

The control angle adjustment part of the silicon controlled rectifier, the counting circuit, the comparison circuit and the digital PID are inside the microprocessor whose model is PIC16C74D.

The motor speed detection circuit mainly consists of several dry reed relays and several differential circuits composed of resistors and capacitors.

The beneficial effects of the utility model are: since the motor speed detection circuit, the counting circuit, the comparison circuit and the digital PID are set between the DC motor and the given input part of the massage force, the rotating speed of the DC motor can be fed back to the motor speed detection circuit and the counting circuit. The comparison circuit compares with the value input by the given input part of the massage force, and the output control signal of the comparison circuit is sent to the thyristor control angle adjustment part through the digital PID to control the speed of the DC motor, so as to achieve the massage force that satisfies the user.

Description of drawings:

Below in conjunction with accompanying drawing, the utility model is further described:

Accompanying drawing 1 is the functional block diagram of the control device of existing massage chair/pad

Accompanying drawing 2 is a block diagram of the utility model

Accompanying drawing 3 is the schematic diagram of motor speed detection circuit

Detailed ways:

See shown in accompanying drawing 2: the control device of the present utility model includes: synchronous circuit, massage strength given input part, thyristor control angle adjustment part, power part, DC motor and massage executive mechanism, in addition, in DC motor and A motor speed detection circuit, a counting circuit, a comparison circuit, and a digital PID are also connected between the given massage force input parts. In order to make the structure simple and compact, the thyristor control angle adjustment part, the counting circuit, the comparison circuit, and the digital PID can use a microprocessor with the above-mentioned function model PIC16C74D.

See attached drawing 3: the motor speed detection circuit mainly includes several reed relays J1, J2...Jn and several groups of differential circuits composed of resistors R1, R2...Rn and capacitors C1, C2...Cn. It has high precision, but its structure is very simple and the cost is very low. When the magnet m coaxial with the motor M passes through any reed relay, the reed relay is closed and grounded, and the capacitor connected to it generates a differential signal to the I/O interface of the microprocessor.

During use, when the load of the DC motor (massage motor) changes, the information of the DC motor speed is sent to the I/O interface of the microprocessor by the motor speed detection circuit (the signal is proportional to the motor speed), and passes through the counting circuit It is sent to the comparison circuit to compare with the set value input by the massage force given part, and the comparison circuit sends the comparison result to the thyristor control angle adjustment part through the digital PID, and then the silicon control angle adjustment part is adjusted through the power part. The rotation speed of the massage motor can be adjusted to obtain the massage force required by the user.

Claims (3)

1. A motor speed negative feedback control device for a massage chair/cushion, comprising: a synchronous circuit, a massage force given input part, a thyristor control angle adjustment part, a power part, a DC motor and a massage actuator, its characteristics The reason is: between the DC motor and the given input part of the massage force, there are motor speed detection circuit, counting circuit, comparison circuit, and digital PID. The numerical value input by the force given input part is compared, and the comparison result is sent from the output terminal of the comparison circuit to the thyristor control angle adjustment part through the digital PID to control the speed of the DC motor. 2. The motor speed negative feedback control device of the massage chair/cushion according to claim 1, characterized in that: the control angle adjustment part of the thyristor, the counting circuit, the comparison circuit, and the digital PID are in the model of PIC16C74D Inside the microprocessor. 3. The motor speed negative feedback control device of the massage chair/cushion according to claim 1 or 2, characterized in that: the motor speed detection circuit is mainly composed of several reed relays and several groups of resistors and capacitors differential circuit.

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